Discharge checking nozzle



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DISCHARGE cHEcxING NozzLE 2 Smets-sheet 1 Filed April 25, 195.0

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United States Patent "ice DISCHARGE CHECKING NOZZLE Oscar Froidevaux,Antony, France, assignor to Tecalemit,

This invention relates to a liquid discharge-controlling nozzle adaptedto be fitted to the end of a liquid-supply conduit provided with a shutoff valve which can cut off the supply of liquid to the nozzle.

An object of the invention is to provide a liquid discharge-controllingnozzle which will stop the discharge of the liquid as soon as the liquidpreviously discharged from the nozzle reaches a predetermined level in acontainer in which it is being collected. The nozzle may therefore beallowed to operate without attention and will automatically shut ol theliquid stream when the liquid in the container has reached the desiredlevel. This nozzle is characterized by the combination of a tubularjacket or casing, a nozzle member longitudinally-movable in the jacketfor receiving the owing stream of liquid through a central bore, thenozzle member cooperating with the jacket to define a fluid-tightchamber which is variable in volume as the nozzle member slideslongitudinally in the jacket, means for creating a vacuum in the chamberby the action of the liquid being discharged through the movablenozzle-member, means responsive to the Vacuum created in the chamber toproduce a longitudinal motion of the movable nozzle-member when theliquid in the container reaches the predetermined level, and afluid-pressure responsive check valve in the jacket for longitudinalmotion therein. The check-valve is adapted to move towards the movablenozzle-member to Y close its central bore Whenever the movablenozzle-member is moved by the action of the vacuum responsive means.

More particular objects and advantages of the invention will be evidentfrom the following description in which reference is had to the appendedsheets of drawings wherein,

Fig. l is an axial sectional view of a nozzle embodying features of theinvention, showing the nozzle in position for full ow of liquid andshowing the relative positions of the nozzle member and the associatedcheck valve;

Fig. 2 is a similar view of the nozzle, the upper portion of the movablenozzle member being in a position closer to the check valve owing to thepresence of a vacuum in the chamber;

Fig. 3 is a similar View in which the check valve is shown at the momentit enters into closing engagement with the movable nozzle member;

Fig. 4 is a similar view showing the check valve in its full closedposition; and

Fig. 5 is an elevational view, partly in section of the nozzle assembledwith a hose provided with a shut-011 valve upstream of the nozzle.

As shown in the drawing, the movable nozzle-member of the nozzleillustrated comprises a tubular inlet portion 1, a diverging outletportion 2, and a short inter-v mediate enlarged portion threadedlyengaged with an external sleeve 3.

The nozzle member is slidably positioned in a tubular jacket or casing 4provided with a transverse end wall 5 having an axial bore 6 in whichthe inlet portion 1 of the movable nozzle-member is slidably guided,while the sleeve 3 is slidably guided in the bore 7 of the main body ofthe tubular jacket 4 in the manner of a piston and cylinder.

The tubular jacket 4 is provided at its open discharge end with internalthreads 8 which are engaged by a protecting end piece 9 which has anannular row of air-intake 2,703,195 Patented Mar. 1, 1955 holes 10formed in its side wall. When the nozzle is used, the end piece 9 ispartially inserted in the container being lled (not shown) with theair-intake holes 10 at the level to which it is desired to fill thecontainer.

The transverse end wall 5 of the jacket 4 is provided with an externalthread 11 for reception of a cap 12 having a top end wall 13 providedwith a circular row of passageways 14 and with a central bore 15 inwhich the stem 16 of a check valve 17 is slidably guided. The checkvalve 17 is retained in its normal open position by a spring 18 whichdraws the valve against the direction of flow of liquid through thenozzle. tained between the end wall 13 of cap 12 and a lock ring 19 heldon the end of valve stem 16 by a pin 20.

Cap 12 is formed with an external annular enlargement or rib 21 tofacilitate retention of the nozzle in the end of a delivery hose whichmay be a rubber hose 22. A shut-oil valve 27 (see Fig. 5) is providedupstream of the nozzle to control the flow of liquid into hose 22.

A vacuum chamber 23 is defined interiorly of the tubular jacket 4adjacent the transverse end wall 5, the volume of the chamber 23 beingvaried by the relative position of the movable nozzle-member, and thesleeve 3 carried by it. The cap 12 defines a chamber 24 above end wall 5in which both the top part of inlet portion 1 and the check valve 17 aredisplaceable.

Vacuum chamber 23 communicates with the bore of the movablenozzle-member through air-passageways 25, while a free annular space isprovided between outlet portion 2 and protecting end piece 9. Arelatively small passageway 26, the purpose of which will be explainedhereinafter, provides communication between vacuum chamber 23 and theportions of the nozzle accessible to the atmosphere.

Assuming that the liquid delivery hose 22 is closed by the shut-offvalve 27, the operation of the device is as follows:

The shut-oli valve 27 is opened and the liquid ows into the nozzlethrough the passageways 14 in the end wall 13 of cap 12, the check valve17 being retained by the return spring 18 in its inoperative positionagainst the stop provided by the solid central portion of end wall 13 ofcap 12 (Fig. l). The liquid flows toward the container to be lled (notshown), through the chamber 24, and through the movable nozzle member.The movable nozzle member operates normally in dry Wall conditions, i.e. in such a manner that no vacuum is created in the vacuum chamber 23during the normal filling of the container by reason of the air-intakeprovided for the chamber 23 by the air-intake holes 10, the passageway26 and the passageways 25.

When the liquid in the container reaches the desired level whichcoincides, as previously mentioned, by the position of the air-intakeholes 10 in the end piece 9 of the nozzle, the stream of liquid wets theinner wall of the outlet portion 2 of the movable nozzle member and, asa result, the air present in the annular chamber 23 is suddenly suckedout. Due to the action of atmospheric pressure upon the bottom of thesleeve 3 on the movable nozzle member the latter is pushed upwardlytowards the ((:llleck v)alve 17 against the direction of flow of theliquid As the nozzle member approaches the check valve 17 and as aconsequence of the throttling of the passageway between the check valveand the inlet to the nozzle member, the pressure on the top of valve 17increases while the pressure below it decreases. Finally, the pressureon the upper side of the check valve becomes suflcient to overcome theaction of spring 18, and the valve is driven into engagement with andfinds a temporary seat on the top edge of the inlet portion 1 (Fig. 3).Thereafter the liquid pressure acts with full force upon the top of thecheck valve 17, with the result that this valve and the movablenozzle-member are forced downwardly by the stream until the bottom ofvalve 17 engages the top of the transverse end wall 5 of the tubularjacket 4 where it remains until the shut-olf valve 27 which controls theflow of liquid upstream of the nozzle is closed (Fig. 4).

During the iilling operation, the movable nozzle member is kept in theposition shown in Fig. l by the combined action of gravity and of thepressure applied to the The spring 18 is retion 1 plus the weight of themovable nozzle-member 1,

2, 3. When the pressure exerted upon the check valve 17 .is released asa consequence of the closing of the shut-oil valve 27, the check valveis lifted back into engagement with the end wall 13 of the cap 12 by theaction of the spring 1S, and the device is ready for a new llingoperation.

As described, the movable nozzle-member operates under dry wallconditions, no vacuum is created within the annular chamber 23 duringthe normal course of tilling the container. However, when the flow ofliquid is first begun, an undesired wetting of the inner wall of thediverging portion 2 may occur due, for example, to the bursting of anair pocket carried along by the liquid under pressure, and this mightresult in an untimely priming of the movable nozzle-member. Such apossibility is prevented by the provision of the small-diameter hole 26through which the vacuum chamber Z3 is in communication with theatmosphere. As long as the member is not ooded, air can ow in throughsaid hole 26 and untimely creation of the vacuum is prevented,

The movable nozzle member may also operate Wet wall conditions with airbeing constantly sucked out f the annular chamber 23 through the holesZ5. However, a vacuum cannot be created within chamber 23 since the airsucked out of it is immediately replaced by air that ows in freelythrough the hole 26. This occurs until the nozzle member becomes floodedas the liquid level reaches the holes 10. At that time air can no longerreach chamber 23 through hole 26 so that the device acts as if no hole26 were provided, and the vacuum created in chamber 23 becomes fullyeffective to actuate the device to shut off the flow of liquid.

What I claim is:

l. A liquid discharge nozzle for automatically stopping the discharge ofthe liquid into a container in which the nozzle s at least partiallyinserted as soon as the liquid in the container reaches a predeterminedlevel, said nozzle comprising a tubular jacket, a nozzle member havingan axial bore mounted for axial sliding movement inside said jacket anddefining a chamber in said jacket variable in volume upon slidingmovement of said nozzle member, the wall of said nozzle member havingpassageways formed therein for connecting said chamber with the bore ofsaid member, means for permitting access of y air to said chamber, acheck valve mounted for axial movement relative to said jacket andpositioned upstream relatively to said nozzle member, said check valvebeing cngageable with said nozzle member upon relative movement of saidvalve and said nozzle member to close the axial bore of the nozzlemember and thereby cut off the supply of liquid to said nozzle member,said nozzle member moving upstream toward said check valve when accessof air to said chamber is prevented by the rising level of the liquid insaid container.

2. A liquid discharge nozzle for automatically stopping the discharge ofthe liquid into a container in which the nozzle is at least partiallyinserted as soon as the liquid in the container reaches a predeterminedlevel, said nozzle comprising a tubulaijacket, a transverse wall in saidjacket having an axial bore, a nozzle member having an axial boremounted for axial sliding movement inside said jacket and having aportion in Huid-tight engagement with the bore of said wall, an externalannular portion on said nozzle member, said annular portion beingpositioned downstream in relation to said wall and being in fluid-tightengagement with the inner surface of the wall of the tubular jacket todene a chamber in said jacket adjacent said Wall and surrounding saidportion of said nozzle member, the wall of said nozzle member havingpassageways formed therein for connecting said chamber with the bore ofsaid member, means for permitting access of air to said chamber, a checkvalve mounted for axial movement relatively to said jacket andpositioned upstream relatively to said nozzle member, said check valvebeing engageable with said nozzle member upon relative movement of saidvalve and said nozzle member to close the axial bore of the nozzlemember and thereby cut off the supply of liquid to said nozzle, saidnozzle member moving upstream toward said check valve when access of airto said chamber is cut olf by the rising level of the liquid in saidcontainer.

3. A liquid discharge nozzle for automatically stopping the discharge ofthe liquid into a container in which the nozzle is at least partiallyinserted as soon as the liquid in the container reaches a predeterminedlevel, said nozzle comprising a tubular jacket, a transverse wall insaid jacket having an axial bore, a nozzle member having an axial boremounted for axial sliding movement inside said jacket and having aportion in Huid-tight engagement with the bore of said wall, an externalannular portion on said nozzle member, said annular portion beingpositioned downstream in relation to said wall and being in Huid-tightengagement with the inner surface of the wall of the tubular jacket todene a chamber in said jacket adjacent said wall and surrounding saidportion of said nozzle member, the wall of said nozzle member havingpassageways formed therein for connecting said chamber with the bore ofsaid member, means for permitting access of air to said chamber, anextension at the discharge end of said jacket for enclosing thedownstream portion of said nozzle member, said extension delining anannular space with the wall of said nozzle member and being formed wothapertures communicating with said space, a check valve mounted for axialmovement relatively to said jacket and positioned upstream relatively tosaid nozzle member, said check valve being engageable with said nozzlemember upon relative movement of said valve and said nozzle member toclose the axial bore of the nozzle member and thereby cut off the supplyof liquid to said nozzle, said nozzle member moving upstream toward saidcheck valve when access of air to said chamber is cut off by the risinglevel of the liquid in said container.

References Cited in the tile of this patent UNITED STATES PATENTS2,244,947 Hargiss June 10, 1941

